libperfmgr: Add a new type of node to manage property

PowerHAL sometimes need set properties, adding a new type of node to
support this usage.

Change-Id: Iea1162b3a82d729241a9ed32fef3241ad46682c4
Fixes: 116731391
Bug: 110166984
Test: Add new unit tests and libperfmgr_test passing
15 files changed